a-a a-b a-c aaa aab aac aad aae aan aao aau ab- aba abb abc abd abe abn abo abu ac- aca acb acc acd ace acn aco acu ad- ada adb adc add ade adn ado adu aea aeb aec aed aee aen aeo aeu an- ana anb anc and ane ann ano anu aoa aob aoc aod aoe aon aoo aou au- aua aub auc aud aue aun auo b-u baa bab bac bad bae ban bao bau bba bbb bbc bbd bbe bbn bbo bbu bca bcb bcc bcd bce bcn bco bcu bda bdb bdc bdd bde bdo bdu be- bea beb bec bed bee ben beo beu bna bnb bnc bnd bne bnn bno bnu boa bob boc bod boe bon boo bou bua bub buc bud bue bun buo buu c-- caa cab cac cad cae can cao cau cba cbb cbc cbd cbe cbn cbo cbu cca ccb ccc ccd cce ccn cco ccu cda cdb cdc cdd cde cdn cdo cdu ce- cea ceb cec ced cee cen ceo ceu cn- cna cnb cnc cnd cne cnn cno cnu co- coa cob coc cod coe con coo cou cua cub cuc cud cue cun cuo cuu daa dab dac dad dae dan dao dau dba dbb dbc dbd dbe dbn dbo dbu dca dcb dcc dcd dce dcn dco dcu dda ddb ddc ddd dde ddn ddo ddu de- dea deb dec ded dee den deo deu dna dnb dnc dnd dne dnn dno doa dob doc dod doe don doo dou dua dub duc dud due dun duo eaa eab eac ead eae ean eao eau eba ebb ebc ebd ebe ebn ebo ebu ec- eca ecb ecc ecd ece ecn eco ecu ed- eda edb edc edd ede edn edo edu eea eeb eec eed eee een eeo en- ena enb enc end ene enn eno enu eo- eoa eob eoc eod eoe eon eoo eou eu- eua eub euc eud eue eun naa nab nac nad nae nan nao nau nba nbb nbc nbd nbe nbn nbo nbu nca ncb ncc ncd nce ncn nco ncu nda ndb ndc ndd nde ndn ndo ndu ne- nea neb nec ned nee nen neo neu nna nnb nnc nne nnn nno nnu no- noa nob noc nod noe non noo nou nua nub nuc nud nue nun nuo nuu oaa oab oac oad oae oan oao oau ob- oba obb obc obd obe obn obo obu oc- oca ocb occ ocd ocn oco ocu oda odb odc odd ode odn odo odu oea oeb oec oed oee oen oeo on- ona onb onc ond one onn ono onu oo- ooa oob ooc ood oon ooo ou- oua ouc oud oue oun ouo ua- uaa uab uac uad uae uan uao uau uba ubb ubc ube ubn ubo ubu uca ucb ucc ucd uce ucn uco ucu uda udb udc udd ude udn udo udu uea ueb uec ued uee uen un- una unb unc und une unn uno unu uoa uob uoc uod uoe uon uoo uua uuc uue uun uuu